In the final draft script of "Mudd's Women", Farrell was established as also having told Kovacs that he wanted to grow a mustache. The script additionally made it clear that he had given her a communicator which, in the episode, Mudd is shown when he uses it, without permission, to contact Rigel XII. In an ultimately unused line of dialogue from the same script, Kovacs remarked about the man, "I hope he doesn't get in trouble... he's really very sweet."

Farrell was on duty at the navigator's station later that year, when an animalistic duplicate of CaptainKirk attempted to take command of the Enterprise and strand a number of crewmembers on the surface of a freezing planet and Farrell nearly believed the lie that the freezing crewmembers cannot be saved. When the other version of Kirk arrived on the bridge, Farrell expressed confusion as to which one of them was actually the captain, until science officerSpock made it clear that the one in command was not to be trusted. (TOS: "The Enemy Within")

Appendices

Farrell was originally conceived as a navigator to replace Dave Bailey, who appeared only in "The Corbomite Maneuver". Although Bailey was initially to have been in "Mudd's Women" prior to the character of Farrell being created, Gene Roddenberry – in a memo to John D.F. Black (dated 19 May1966) – inspired the invention of the Farrell character by proposing, "Since we have no way of knowing which show will air first, it is probably best we play safe with another Navigator under another name."

In the final draft script of "Mudd's Women" (dated 26 May1966), Farrell had the first name "Jim" (Sulu, at one point, referred to him as "James-o" rather than, as he does in the episode, calling him "Johnny-o"). The same script also described Farrell as "a super-conscious twenty-eight-year-old... red-haired, one of those people who fight to put out 100 percent all the time... which is too much sometimes." The fact he was referred to as twenty-eight at the time of the installment suggests he was born in 2238. In an ultimately unused line of dialogue later in the script, Farrell himself alluded to having a girlfriend, saying, "I've got a girl back in..." though he didn't complete the sentence.